*Reference design enables scalable battery management for high-voltage battery packs with integrated monitoring, protection, cell balancing and isolated communication.*
High-Voltage, Modular Battery Management System

Microchip Technology has unveiled a reference design for a modular BMS operating on high voltage for battery applications in the industrial, consumer electronics and power-conversion sectors. The design features a scalable three-module structure integrating a battery management controller together with separate voltage and current monitoring modules that enable battery packs to be developed from low-voltage to high-voltage configurations. With a modular design, extra modules can be integrated when increasing the capacity of the batteries while keeping the same hardware architecture.

The reference design uses an eight-channel analogue front end within the voltage monitoring module to measure individual battery-cell voltages up to 32 V. In addition,



Current measurement is performed using a shunt-based measurement method together with an analogue front end power monitor to measure voltage, current and energy-consumption parameters. Moreover, there is also thermal monitoring using silicon-based digital temperature sensors.

The protection and diagnostic capabilities incorporated into the design enhance the safety and reliability of battery operation. These include passive cell balancing, overvoltage and undervoltage protection, overcurrent protection, overtemperature and undertemperature protection, and rapid short-circuit protection with a response time of 2.5 µs. The embedded fuel-gauging algorithms provide estimates of the State of Charge (SOC) and State of Health (SOH).

The reference design is designed to work within scalable battery systems. Each monitoring module supports up to 16 battery cells. Moreover, one can connect up to 51 monitoring modules, which supports up to 408 battery cells with a maximum battery voltage of 1632VDC. Communication among

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